diff --git a/camera/QCamera2/stack/common/mm_camera_shim.h b/camera/QCamera2/stack/common/mm_camera_shim.h
index d134114..76917cb 100644
--- a/camera/QCamera2/stack/common/mm_camera_shim.h
+++ b/camera/QCamera2/stack/common/mm_camera_shim.h
@@ -94,6 +94,6 @@ typedef struct {
     int32_t (*mm_camera_shim_send_cmd)(cam_shim_packet_t *event);
 } mm_camera_shim_ops_t;
 
-int32_t (*mm_camera_shim_module_init)(mm_camera_shim_ops_t *shim_ops);
+extern int32_t (*mm_camera_shim_module_init)(mm_camera_shim_ops_t *shim_ops);
 
 #endif  /*__MM_CAMERA_SHIMLAYER_H_*/
diff --git a/camera/QCamera2/stack/mm-camera-interface/src/mm_camera_interface.c b/camera/QCamera2/stack/mm-camera-interface/src/mm_camera_interface.c
index f76fa56..2b4c0f3 100644
--- a/camera/QCamera2/stack/mm-camera-interface/src/mm_camera_interface.c
+++ b/camera/QCamera2/stack/mm-camera-interface/src/mm_camera_interface.c
@@ -51,6 +51,8 @@
 #include "mm_camera.h"
 #include "mm_camera_muxer.h"
 
+int32_t (*mm_camera_shim_module_init)(mm_camera_shim_ops_t *shim_ops);
+
 static pthread_mutex_t g_intf_lock = PTHREAD_MUTEX_INITIALIZER;
 static mm_camera_ctrl_t g_cam_ctrl;